The Study of Remediation in Soil Cyanide Using Vetiveria Zizanioides

  Cyanide is one of the most important contamination in the soil and environment. In recent years, researchers have studied the decline in cyanide levels by physical, chemical and biological methods. The phytoremediation is one of the new methods for reducing and refining soil and water contaminants. The main objective of this research is to investigate the Phytoremediation of cyanide with vetiver plant (Vetiveria zizanioides). A greenhouse experiment was conducted in a greenhouse experiment in a randomized design with three same samples in a research greenhouse in 1396 to evaluate the effectiveness of vetiver plant ( Vetiveria zizanioides) in different concentrations of cyanide. After providing the vetiver seedlings (Vetiveria zizanioides), they were grown in pots containing different concentrations of cyanide. Seven treatments of different concentrations were used in this experiment (mean cyanide content in soil G,14.37 mg / kg, F soil, 13.77mg / kg, E soil, 8.09 mg / kg, D soil ,7.53 mg / kg, soil C,3.23 mg / kg, soil B, 2.52 mg / kg and soil A without cyanide (as control)). In two periods of two and four months, the amount of cyanide of the whole soil and plant (Vetiveria zizanioides) was measured by distillation machine. The length of plant, leaf and roots were also evaluated and the results were analyzed by SPSS15 software and Paired Samples T test was evaluated. The results indicated that the increase in cyanide content had a significant effect on vegetative characteristics of the plant, and the highest leaf, root and plant length were in treatment A and the lowest in treatment of G, and the amount of cyanide in the leaves and roots of the plant had been increased.However, by comparing the amount of cyanide in two months and four months, cyanide amounts decreased over time in the plant, and the level of cyanide in the soil of different treatments was significantly lower in terms of cyanide content. In general, the results of this reseach indicate that increasing cyanide content in the soil leads to changes in the morphological characteristics of the plant (for example length of Leaf , length of root and length of plant (Vetiveria zizanioides) , and vetiver plant has a very high resistance to soil cyanide, and over time, the amount of cyanide in the soil decreases and the amount of cyanide in the plant (Vetiveria zizanioides) has been reduced .